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POMouse event handling with cvSetMouseCallback
 

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  1. POMouse event handling with cvSetMouseCallback
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    <p>I am writing a code for eye tracker using OS X / X Code / OpenCV 2.2. As part of the Eye Tracker training process, I am using cvSetMouseCallback to capture the data as per following: Right click for right eye; Left click for left eye.</p> <p>However, I found that the program could only work with left click (CV_EVENT_LBUTTONDOWN) while it does not work with right click (CV_EVENT_RBUTTONDOWN). At first, I thought it was a trackpad and mouse setting issues, however, it turns out that I have already set both Secondary Click as "Right" in the machine. Appreciate if someone could shed some light on this? Thank you for your time to look into this.</p> <p>For those interested, I have a simple code snippet for cvSetMouseCallback:</p> <pre><code>#include &lt;cv.h&gt; #include &lt;cxcore.h&gt; #include &lt;highgui.h&gt; void my_mouse_callback( int event, int x, int y, int flags, void* param ); int main (int argc, const char * argv[]) { CvCapture *capture; IplImage *img; int key = 0; // initialize camera capture = cvCaptureFromCAM( 0 ); // always check assert( capture ); // create a window cvNamedWindow( "video", 1 ); while( key != 'q' ) { // get a frame img = cvQueryFrame( capture ); // set the mouse callback function. cvSetMouseCallback( "video", my_mouse_callback, (void*) img); // always check if( !img ) break; // 'fix' frame cvFlip( img, img, 1 ); img-&gt;origin = 0; cvShowImage("video", img ); // quit if user press 'q' key = cvWaitKey( 5 ); } // free memory cvReleaseCapture( &amp;capture ); cvDestroyWindow( "video" ); return 0; } void my_mouse_callback( int event, int x, int y, int flags, void* param ){ //IplImage* image = (IplImage*) param; switch( event ){ case CV_EVENT_LBUTTONDOWN: printf("LBUTTONDOWN\n"); break; case CV_EVENT_RBUTTONDOWN: printf("RBUTTONDOWN\n"); break; case CV_EVENT_FLAG_CTRLKEY: printf("FLAG_LBUTTONDBLCLK\n"); break; } } </code></pre>
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